wpf - 當單選按鈕被選中或者沒有單選按鈕被選中時，checkbox.isvisible是真實的

Question

我是Wpf的新手 我有一組3個單選按鈕 用於所有的複選框，單選按鈕變得異常或組中的第三個單選按鈕被選中。

我想知道是否有辦法做到這一點？ 我嘗試構建booleanToVisibility但它不起作用。 我需要使用類似多個數據觸發器的東西嗎？謝謝！

Answer 1

你是對的MultiBinding。 XAML中應該是這樣的：

<Window.Resources> 
    <local:MultiBoolToVisibilityConverter x:Key="MultiBoolToVisibilityConverter"/> 
</Window.Resources> 
<DockPanel> 
    <StackPanel DockPanel.Dock="Top"> 
     <RadioButton Name="rb1" Content="1"/> 
     <RadioButton Name="rb2" Content="2"/> 
     <RadioButton Name="rb3" Content="3"/> 
    </StackPanel> 
    <CheckBox DockPanel.Dock="Bottom" Content="Visible when 1 or 2 is checked."> 
     <CheckBox.Visibility> 
      <MultiBinding Converter="{StaticResource MultiBoolToVisibilityConverter}"> 
       <Binding Path="IsChecked" ElementName="rb1" /> 
       <Binding Path="IsChecked" ElementName="rb2" /> 
       <Binding Path="IsChecked" ElementName="rb3" /> 
      </MultiBinding> 
     </CheckBox.Visibility> 
    </CheckBox> 
</DockPanel> 

轉換器中MultiBoolToVisibilityConverter應該在後面的代碼中定義，實施IMultiValueConverter

public class MultiBoolToVisibilityConverter : IMultiValueConverter 
{ 
    public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture) 
    { 
     bool? firstRadioButtonIsChecked = values[0] as bool?; 
     bool? secondRadioButtonIsChecked = values[1] as bool?; 
     bool? thirdRadioButtonIsChecked = values[2] as bool?; 

     //set your logic. this is just an example: 
     if (firstRadioButtonIsChecked == true || secondRadioButtonIsChecked == true) 
      return Visibility.Visible; 
     return Visibility.Collapsed; 

    } 

    public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture) 
    { 
     throw new NotImplementedException(); 
    } 
} 

進一步的問題，你可以看到this post on MultiBinding and IMultiValueConverter其他谷歌的建議之一。